Automatic bag-weighing machine



Sept. 30, 1930. H, ROT 1,777,227

AUTOMATIC BAG WEIGHING MACHINE I Filed Jan. '7, 1930 I5 0 Rat/L,

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Patented Sept. 30, 1930 HUGO ROTH, F BRUNSWICK, GERMANY,

PATENT OFFICE ASSIGNOR TO MIAG MUHLENBAU UND INDUSTRIE .AKTIENGESELLSCHAFT, 0F FRANKFORT-ON-THE-MAIN, GERMANY AUTOMATIC BAG-WEIGHING MACHINE Application filed January 7, 1930, Serial No.

My invention relates to improvements in automatic bag weighing machines, and the object of the improvements is to provide a weighing machine intended primarily for use with paper bags, though not limited thereto, in which the bag after being filled to the desired weight is automatically re leased from the material supplying trunk, the means for releasing the bag preferably comprising electromagnetically operated means. Y

For the purpose ofexplaining the invention an example embodying the same has been illustrated in the accompanying drawing showing the weighing machine in a diagrammatical way.

'In the example shown in-the figure the weighing machine comprises a pillar 9 carrying a socket n on which the scale beam 0 or other suitable arm of the weighing machine is supported by means of a knife edge m. From the right-hand end of the beam 0 weight or a pan 72 carrying the weightor weights is suspended, and from. the lefthand side a bail h is suspended. On the said bail two arms at, w are rockingly mounted which are adapted to clamp the bag is between the same. A spring to tends to spread the arms 00, w for releasing the bag. An electromagnet i is mounted on the bail h and this electromagnet serves to draw the arms together when the bag is to be clamped between them, the electromagnet being of strength sufiicient to compress the spring and i draw the arms together so as to hold the bag securely. The material to be weighed is supplied to the bag through a trunk or pipe 0. The winding of the electromagnet i is connected by a lead f with a source of electric energy a, a switch 3 a lead b and the socket n. To the beam a contact 03 is fixed which is adapted to engage a relatively fixed contact e connected by a leadf with the second terminal of the electromagnet i.

The operation of the weighing machine is as follows:

The bag to be filled is placed} with its mouth on the trunk c, and the arms m, a: are

419,126, and in Germany December 31, 1928.

so that current is supplied to the winding begins its downward movement, the contacts d, 6 remain at first in sliding engagement,

and only after the desired weight of material has been supplied to the bag does the contact d leave the relatively fixed contact e thus interrupting the circuit of the electromagnet and allowing the bag k to be released from the clamping arms a), a: and the trunk c.

In lieu of the electromagnet solenoids may be provided and it will be understood that other changes may be 'made in the device of my invention, as will be obvious to those skilled .in .the art, all without departing from the spirit ofthe invention.

I claim:

1. The herein described weighing machine, comprising a scale arm, electromag-v netically operated clamping means on said arm adapted to hold a bag, means for supplying material to said bag, a switch in the circuit of said electromagnetic means, and means controlled by the movement of said arm for opening the switch when the bag 1 attains a predetermined weight.

2. The herein described weighing machine, comprising a scale arm, electromag netically operated clamping means on said arm adapted to grasp a bag at its upper rim,

means for supplying material to said bag. a switch in the circuit of said electromagnetic means, and means operated by the movement of said arm for opening said switch when the bag has been filled to a predetermined extent.

HUGO ROTH.

placed into position for clamping the upper rim of the bag. Now the switch 3/ is closed, 

